<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>用户登录页面</title>
</head>
<body>
  <h1>登录界面</h1>
  <form action="/login" method="get">
    <p>用户名<input name="username"></p>
    <p>密&nbsp;&nbsp;&nbsp;码<input name="password"></p>
    <input type="submit">
  </form>
</body>
</html>